Physics Paper 1
Density and states
Particle Model training before the targeted original question drill.
Adaptive teaching card
Make it concrete
Analogy
Density and states is like tracking a system with arrows and numbers: decide what changes, what stays conserved, and what equation describes it.
Why now: An analogy helps when the definition feels abstract.
Do this: Match each part of the analogy to the science idea.
Learn it
Density equals mass divided by volume.
Heating changes the internal energy of a substance.
Changes of state are physical changes and do not change mass.